"Gemma di Vergy" in Stanley Sadie (Ed.), The New Grove Dictionary of Opera, Vol. Two, p. 373. London: Macmillan Publishers, Inc. Loewenberg, Alfred (1970). Annals of Opera, 1597-1940, 2nd edition. Rowman and Littlefield Osborne, Charles, (1994), The Bel Canto Operas of Rossini, Donizetti, and Bellini, Portland, Oregon: Amadeus Press. Sadie, Stanley, (Ed.); John Tyrell (Exec. Ed.) (2004), The New Grove Dictionary of Music and Musicians. 2nd edition. London: Macmillan. (hardcover). (eBook). Weinstock, Herbert (1963), Donizetti and the World of Opera in Italy, Paris, and Vienna in the First Half of the Nineteenth Century, New York: Pantheon Books. External links Donizetti Society (London) website Libretto (Italian) Operas by Gaetano Donizetti Italian-language operas Operas 1834 operas Opera world premieres at La Scala Operas based on plays Operas based on works by Alexandre Dumas